Renesas AT25SF081B-SSHD-B

Overview

AT25SF081B-SSHD-B from Renesas Electronics is an 8 M-bit Serial Flash memory IC supporting SPI modes 0/3, dual I/O (1-2-2), quad I/O (1-4-4, 0-4-4), and execute-in-place (XiP) operation. It delivers 108 MHz max read frequency, 4 kB sector erase (60 ms typ), and operates across -40°C to +85°C for embedded boot code storage in industrial controllers and IoT edge nodes.

For engineers reviewing the AT25SF081B-SSHD-B datasheet, AT25SF081B-SSHD-B pinout, AT25SF081B-SSHD-B application, or AT25SF081B-SSHD-B equivalent, key selection criteria include quad-SPI XiP support, 1.2 µA deep power-down current, OTP security registers, SFDP compliance, and SOIC-8 (208-mil wide) package compatibility with legacy PCB layouts.

Technical Context

The AT25SF081B-SSHD-B implements a flexible SPI flash architecture with dual/quad I/O command sets enabling high-throughput data fetches-critical for XiP execution. Its memory array supports four erase granularities (4/32/64 kB blocks and full chip), each with deterministic timing (e.g., 200 ms typ for 64 kB erase).

Internal control logic integrates write protection via WP pin and status register bits (SRP0/SRP1), plus suspend/resume for program/erase operations. The device uses a dedicated SRAM data buffer and Y/X-decoder structure to enable continuous read with wrap (8/16/32/64-byte) and burst-mode timing optimized for low-latency instruction fetch.

Key Specifications

Pinout & Package

AT25SF081B-SSHD-B is packaged in an 8-lead, 208-mil wide EIAJ SOIC (JEDEC MS-012AC) with standard pin pitch and footprint. This green RoHS-compliant package supports reflow soldering and offers mechanical robustness for industrial environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial flash memory applications.

Compared with W25Q80DVSSIG and MT25QL80ABB8E12-0SIT, the AT25SF081B-SSHD-B uniquely balances XiP-optimized 0-4-4 read mode, integrated OTP security, and ultra-low deep power-down current in a compact 208-mil SOIC package-making it optimal for resource-constrained, security-aware embedded designs.

Availability

AT25SF081B-SSHD-B is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT25SF081B-SSHD-B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets with emphasis on reliability and functional safety.

The AT25SF081B-SSHD-B belongs to Renesas' AT25SF family of SPI flash memories engineered specifically for execute-in-place (XiP) boot and firmware storage in space- and power-constrained embedded systems.

FAQ

What is the maximum SPI clock frequency supported by the AT25SF081B-SSHD-B?

The AT25SF081B-SSHD-B supports a maximum SPI clock frequency of 108 MHz in quad I/O (1-4-4) and quad output (1-1-4) modes. This specification is validated under 2.5–3.6 V supply and -40°C to +85°C ambient conditions per the official Renesas datasheet DS-AT25SF081B-189 Rev. H. Higher frequencies are not guaranteed and may result in read errors or timing violations.

Does the AT25SF081B-SSHD-B support execute-in-place (XiP) operation?

Yes, the AT25SF081B-SSHD-B explicitly supports execute-in-place (XiP) operation through its 0-4-4 command format, which eliminates opcode transmission overhead and enables continuous instruction fetch directly from flash. This feature is documented in Section 1 (Product Overview) and Section 5.4 (Quad I/O Read) of the AT25SF081B-SSHD-B datasheet.

How many one-time programmable (OTP) security registers does the AT25SF081B-SSHD-B include?

The AT25SF081B-SSHD-B includes three 256-byte one-time programmable (OTP) security registers, accessible via dedicated commands (42h program, 48h read, 44h erase). These registers are physically isolated from the main memory array and provide tamper-resistant storage for cryptographic keys or unique device identifiers.

What package type is used for the AT25SF081B-SSHD-B?

The AT25SF081B-SSHD-B uses an 8-lead, 208-mil wide EIAJ SOIC package (also referenced as SOIC-8 Wide), as confirmed in Section 15 (Ordering Information) and Figure 1 of the AT25SF081B-SSHD-B datasheet. This package is RoHS-compliant, halogen-free, and compatible with standard surface-mount reflow processes.

Can the AT25SF081B-SSHD-B operate at 2.5 V supply voltage?

Yes, the AT25SF081B-SSHD-B supports dual supply voltage ranges: 2.5 V – 3.6 V and 2.7 V – 3.6 V. Operation at 2.5 V is fully specified and validated across all AC/DC parameters including 108 MHz read frequency, 60 ms sector erase, and 1.2 µA deep power-down current, as stated in the Features section of the datasheet.